Plural reed reciprocating

ABSTRACT

Fluid is caused to enter a nozzle in which a ring conduit is concentrically located to form an annular orifice. The fluid discharging from the annular orifice impinges directly on the edge of a resonating cavity producing a multiple frequency edgetone. The column of air in the resonating cavity is thereby caused to vibrate at a frequency determined by the depth of the cavity. The changes in pressure within the resonating cavity cause two diaphragms, diametrically opposite and longitudinally placed therein, to pulsate. To each diaphragm is connected a rod for transmitting the pulsations to metallic reeds, which are in turn free to oscillate within a pair of magnetic pole pieces. The oscillations of the reeds induce an electromotive force in a coil surrounding each reed. The resultant electrical currents produced by each coil are combined in series and phase to provide maximum energy for the operation of an external electrical circuit.

United States Patent [72] Inventors Fernando Villarroel Bowie; CarlJoseph Campagnuolo, Potomac, Md. [21] Appl. No. 876.938 [22] Filed Nov.14, 1969 [45] Patented Jan.l2, 1971 [73] Assignee to the United Statesof America as represented by the Secretary of the Army [54] PLURAL REEDRECIPROCATING GENERATOR 4 Claims, 1 Drawing Fig.

[52] [1.8. CI 310/15, 310/25: 333/71 331/156: 290/1 [51] Int. Cl [102k35/06 [50] Field ofSearch 3l0/15,22,25;179/115.5DVC.115.5PS,114R,115R,119R; 333/71; 331/116, 156; 290/1 [56]References Cited UNlTED STATES PATENTS 2,111,036 3/1938 Wippel 3l0/25X2,215,895 9/1940 Wippel 310/25X 2,895,063 7/1959 Morris 3,015,953 1/1962Peltola Primary Examiner-D. F. Duggan Att0rneysl-larry M. Saragovitz,Edward J. Kelly, Herbert Berl and J. D. Edgerton ABSTRACT: Fluid iscaused to enter a nozzle in which a ring conduit is concentricallylocated to form an annular orifice. The fluid discharging from theannular orifice impinges directly on the edge of a resonating cavityproducing a multiple frequency edgetone. The column of air in theresonating cavity is thereby caused to vibrate at a frequency determinedby the depth of the cavity. The changes in pressure within theresonating cavity cause two diaphragms, diametrically opposite andlongitudinally placed therein, to pulsate. To each diaphragm isconnected a rod for transmitting the pulsations to metallic reeds, whichare in turn free to oscillate within a pair of magnetic pole pieces. Theoscillations of the reeds induce an electromotive force in a coilsurrounding each reed. The resultant electrical currents produced byeach coil are combined in series and phase to provide maximum energy forthe operation of an external electrical circuit.

PLURAL REED RECIPROCATINGGENERATOR RIGHTS or GOVERNMENT The inventiondescribed herein may be manufactured, used, and licensed by or for theUnited States Government for governmental purposes without the paymentto us of any royalty thereon.

BACKGROUND OF THE INVENTION I the fluidic generator disclosed in US.application No. 745,949

filed June 17, 1968 by Campagnuolo et al. and possesses all theadvantages of that device as well as other and additional advantagesapparent from the disclosure hereinafter.

In certain uses involving the aforementioned fluidic generator, there isneed for an increased electrical power output. The obvious way ofachieving this is to increase the size of the generator itself, thusproviding a larger pneumatic energy input to produce the needed increasein electrical energy output. This solution provides fiuidic generatorsthat are oversized and unwieldy for those applications that requiredcompact, small-sized generators. In addition, there are situations inwhich the available source of pneumatic energy is limited, thus makingit useless to use a larger generator since the limited source could notdrive the generator to its larger output.

Accordingly, a primary object of the present invention is to provide animproved fluidic generator for, use as a pneumaticto-electrical energyconverter that operates with a much higher efficiency than previousexisting models, thus yielding a larger electrical energy output whilemaintaining compactness in size and reliability in operation.

SUMMARY OF THE INVENTION The aforementioned and other objects may beobtained by using a fluid oscillator in which two diaphragms arediametrically placed in the oscillator resonating cavity and bydirecting the fluid which is the source of power of the oscillatordirectly toward the cylindrical opening of the resonating cavity from anannular orifice. The fluid discharging from the annular orifice impingeson the edge of the opening of the resonating cavity producing a multiplefrequency edgetone or ringtone thereby causing the column of gas in theresonating cavity to vibrate at a predetermined frequency. The changesin pressure within the resonating cavity cause the two diaphragms topulsate. To each of the two diaphragms is connected a reed which is freeto oscillate within a magnetic field. The oscillations of the reeds inresponse to the pulsating diaphragms induce electrical currents in thecoils that surround each reed. The coils are connected in series and inphase such that the separate currents produced are added for subsequentexternal use.

BRIEF DESCRIPTION OF THE DRAWING The specific nature of the invention aswell as other objects, aspects, uses, and advantages thereof willclearly appear from the following description an from the accompanyingdrawing, in which:

The drawing is a sectional view of a preferred embodiment of the dualfiuidic generator of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawing the fluid powerfor the generator enters a port 10 formed by a cylinder 12. At the endof cylinder 12 are circumferentially located a number of apertures 14through which the fluid enters an annular orifice 16 formed by a ringconduit 17 The annular column of fluid formed by annular orifice 16 1Sdirected to the opening 20 in a resonating cavity 22 by means of aconduit 19 which has openings 18 through which excess fluid is exhaustedto the atmosphere. Annular orifice 16 is of a slightly smaller diameterthan opening 20, but thecolumns of fluid emanating from orifice 16 willtend to spread and impinge upon the edge of opening 20. The impinging ofthe fluid on this edge, in the well known manner, will produce amultiple frequency edgetone or ringtone. The oscillation of the annularcolumn of fluid back and forth across the end of opening 20 will causethe column of fluid in the resonating cavity 22 to vibrate at afrequency determined by the depth of cavity 22. Note that the remainingstructure and operation of the dual generator is symmetrical withrespect to line A-A'. The vibration of the fluid in cavity 22 will inturn cause the diaphragms 24 to pulsate. The pulsations of diaphragms 24are transmitted by means of the rods 26 to the armatures 28 which arethen caused to oscillate between the magnetic pole pieces of oppositepolarity 30 and 32. The oscillations of armatures 28 between magneticpole pieces 30 and 32 will induce electromotive forces in coils 34;these E.M.F.'s are then coupled through wires 36 and 38 to an externalcircuit (not shown) that combines in series and phase the currentsproduced by coils 34.

The resultant electrical energy can be used as a power supply formunition fuzes and related devices requiring a compact environmentalpower source with a high power output. The dual electrical powerconverter comprised of diaphragms 24, rods 26, armatures 28, magneticpole pieces 30 and 32, and coils 34 coupled to the single resonatingcavity 22 results in an appreciable increase in power efficiency overthe single diaphragm coil system of previous models.

We wish it to be understood that we do not desire to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

We claim:

1. Apparatus for utilizing fluid flow to generate electrical energy,comprising:

a. an enclosed volume having an open end and a closed end and defining aresonant cavity,

b. an annular orifice directing an annular column of fluid directly intoand so as to impinge upon an edge of said open end of said enclosedvolume so as to produce a multiple frequency edgetone thereby causingthe fluid in said enclosed volume to vibrate at predetermined frequency,

c. mechanical means comprising first and second diaphragms suspendedlongitudinally and diametrically opposite within said enclosed volumefor sensing the said fluid vibrations therein and for pulsating inresponse thereto,

d. generating means comprising first and second magnetic field producingmeans, first and second metallic reeds, means connecting said first andsecond metallic reeds to said first and second diaphragms, respectively,and first and second coils located in close proximity around said firstand second reeds respectively; whereby said metallic reeds oscillatewithin said magnetic fields in response to said pulsations of saiddiaphragms for inducing electrical currents in said coils, and

e. electrical circuit means to combine the said currents produced bysaid first and second coils and to provide an external connectiontherefor.

2. The invention according to claim 1 wherein said frequency ofvibration of said fluid within said enclosed volume is determined by thedepth of said resonant cavity.

3. The invention according to claim 1 wherein said open end of saidresonant cavity is formed by a cylinder.

4. The invention according to claim 1 wherein said annular column offluid is formed by a ring conduit in communication with an externalsource of fluid.

1. Apparatus for utilizing fluid flow to generate electrical energy,comprising: a. an enclosed volume having an open end and a closed endand defining a resonant cavity, b. an annular orifice directing anannular column of fluid directly into and so as to impinge upon an edgeof said open end of said enclosed volume so as to produce a multiplefrequency edgetone thereby causing the fluid in said enclosed volume tovibrate at predetermined frequency, c. mechanical means comprising firstand second diaphragms suspended longitudinally and diametricallyopposite within said enclosed volume for sensing the said fluidvibratioNs therein and for pulsating in response thereto, d. generatingmeans comprising first and second magnetic field producing means, firstand second metallic reeds, means connecting said first and secondmetallic reeds to said first and second diaphragms, respectively, andfirst and second coils located in close proximity around said first andsecond reeds respectively; whereby said metallic reeds oscillate withinsaid magnetic fields in response to said pulsations of said diaphragmsfor inducing electrical currents in said coils, and e. electricalcircuit means to combine the said currents produced by said first andsecond coils and to provide an external connection therefor.
 2. Theinvention according to claim 1 wherein said frequency of vibration ofsaid fluid within said enclosed volume is determined by the depth ofsaid resonant cavity.
 3. The invention according to claim 1 wherein saidopen end of said resonant cavity is formed by a cylinder.
 4. Theinvention according to claim 1 wherein said annular column of fluid isformed by a ring conduit in communication with an external source offluid.